Soft magnetic core body and motor

Abstract

The utility model belongs to the technical field of magnetic cores, and discloses a soft magnetic core body and a motor, the soft magnetic core body is formed by extruding and annealing soft magnetic material powder in a shaped die, the soft magnetic core body internally comprises a non-magnetic metal piece, when the soft magnetic core body is processed, the soft magnetic material powder and the non-magnetic metal piece are mixed and placed in the die, and the non-magnetic metal piece is placed in the die. The non-magnetic metal piece plays a connecting role in the soft magnetic core body, the strength of the soft magnetic core body is improved, the soft magnetic core body is not prone to being broken, the magnetism of the whole soft magnetic core body is not affected by adding of the non-magnetic metal piece, it is guaranteed that the function of the soft magnetic core body is not affected, the non-magnetic metal piece can be arranged to be in a net shape or a strip shape, and when the non-magnetic metal piece is in a net shape, the non-magnetic metal piece is not prone to being broken. And the non-magnetic metal parts are laid in the soft magnetic material powder, and when the non-magnetic metal parts are strip-shaped, the non-magnetic metal parts are directly mixed with the soft magnetic material powder, so that the processing of the soft magnetic core body is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic cores, in particular to a soft magnetic core and a motor. Background Art

[0002] Soft magnetic composite materials (referred to as SMC materials) are made by pressing soft magnetic particles with electrical isolation layers (including pure iron powder and Fe-based soft magnetic materials such as iron silicon, iron silicon chromium, iron silicon aluminum, iron nickel, iron cobalt, etc.) with powder metallurgy process and then heat treating them. It is a magnet with high magnetic permeability, low loss and three-dimensional isotropy. As the core part of reactors, transformers, inductors, filters, frequency modulation chokes, switching power supplies and motor stators, it is widely used in telecommunications, radar, power supplies, electronics, electrical appliances, motors and power technologies. However, soft magnetic composite materials have low strength and poor pressure resistance, and are easy to break during use. Some manufacturers increase the pressure resistance of the soft magnetic core and reduce the risk of breaking by coating gaskets or protective films on the periphery of the soft magnetic core. However, the scheme of coating gaskets and protective films on the soft magnetic core will shield the magnetic properties of the soft magnetic core, reduce the magnetic properties that the soft magnetic core can emit, and affect the performance of the soft magnetic core.

[0003] Therefore, there is an urgent need for a soft magnetic core and a motor to solve the above technical problems. Utility Model Content

[0004] The first purpose of the utility model is to provide a soft magnetic core which not only has strong compressive resistance but also has good magnetic properties.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A soft magnetic core, wherein a non-magnetic metal part is provided inside the soft magnetic core, and the non-magnetic metal part is co-extruded with soft magnetic material powder;

[0007] The non-magnetic metal piece is in a mesh or strip shape, and is laid in the soft magnetic material powder.

[0008] As a preferred technical solution for the soft magnetic core, when the non-magnetic metal piece is in a mesh shape, the non-magnetic metal piece is placed horizontally or vertically in the soft magnetic core.

[0009] As a preferred technical solution for the soft magnetic core, the non-magnetic metal part is a flexible part.

[0010] As a preferred technical solution for the soft magnetic core, the laying shape of the non-magnetic metal piece is consistent with the cross-sectional shape of the soft magnetic core.

[0011] As a preferred technical solution for the soft magnetic core, a plurality of grooves are provided on the surface of the non-magnetic metal part.

[0012] The second object of the utility model is to provide a flux motor. To achieve this object, the utility model adopts the following technical solutions:

[0013] A flux motor comprises a rotating shaft, a rotor and a stator sleeved on the rotating shaft, wherein the rotating shaft is connected to the rotor and can rotate together with the rotor, and is characterized in that the stator and / or the rotor comprises the soft magnetic core described in any one of the above items.

[0014] As a preferred technical solution of the motor, the rotor comprises a rotor disk, a plurality of the soft magnetic cores, and the plurality of the soft magnetic cores are radially spaced on the rotor disk along the circumferential direction;

[0015] The stator comprises a stator disk and a plurality of soft magnetic cores, wherein the plurality of soft magnetic cores are radially spaced and distributed on the stator disk along a circumferential direction;

[0016] The cross-section of the soft magnetic core is fan-shaped or triangular.

[0017] As a preferred technical solution of the motor, the stator includes a magnetic reinforcement member and a conductor, the magnetic reinforcement member is arranged between the soft magnetic cores and connected with the soft magnetic cores to form a ring body, and the conductor is arranged on the soft magnetic cores.

[0018] As a preferred technical solution of the motor, the soft magnetic core comprises a main body and a connecting part arranged on the main body, and the conductor is connected to the main body;

[0019] When the main body is protrudingly disposed on both sides of the connecting portion, the non-magnetic metal member is disposed inside the main body;

[0020] When the main body is protruding from one side of the connecting part, the non-magnetic metal part is arranged in the main body and the connecting part.

[0021] As a preferred technical solution of the motor, the soft magnetic core is a sector-shaped body with continuous grooves, the soft magnetic core has two main body parts, the connecting part connects the two main body parts, a partition is provided on the connecting part, and the partition is located between the two main body parts;

[0022] The non-magnetic metal part inside the soft magnetic core is divided into a connecting section and two main sections. The two main sections are located on both sides of the connecting section, and the main section is connected to the connecting section at an angle.

[0023] The beneficial effects of the utility model are:

[0024] The soft magnetic core of the present utility model has a non-magnetic metal part added inside the soft magnetic core body. The non-magnetic metal part can play a connecting role inside the soft magnetic core body, enhancing the strength of the soft magnetic core body, making it relatively less likely to break, thus improving the strength of the soft magnetic core body and extending its service life. The non-magnetic metal part does not shield the magnetism of the soft magnetic core body. Therefore, the addition of the non-magnetic metal part does not affect the overall magnetism of the soft magnetic core body, achieving the improvement of the strength of the soft magnetic core body and ensuring that the function of the soft magnetic core body is not affected.

[0025] For the flux motor of the present utility model, a soft magnetic core body is provided in the stator and rotor of the flux motor. Under the action of the soft magnetic core body, the magnetism of the stator and rotor is enhanced, enabling the flux capacity of the flux motor to increase, being able to withstand a greater load, improving the performance of the motor, and making the application scenarios more extensive. Brief Description of the Drawings

[0026] Figure 1 is a schematic cross-sectional view of the soft magnetic core body provided by the present utility model from the first perspective;

[0027] Figure 2 is a schematic cross-sectional view of the soft magnetic core body provided by the present utility model from the second perspective;

[0028] Figure 3 is a schematic structural view of the flux motor provided by the present utility model;

[0029] Figure 4 is a schematic view of the H-shaped soft magnetic core body provided by the present utility model;

[0030] Figure 5 is a schematic view of the "cross"-shaped soft magnetic core body provided by the present utility model;

[0031] Figure 6 is a schematic view of the "C"-shaped soft magnetic core body provided by the present utility model;

[0032] Figure 7 is a schematic view of the T-shaped soft magnetic core body provided by the present utility model;

[0033] Figure 8 is a schematic view of the soft magnetic core body in the shape of a sector with continuous grooves provided by the present utility model;

[0034] Fig. 9 is a transmission view of the soft magnetic core body in the shape of a sector with continuous grooves provided by the present utility model;

[0035] Fig.10 is a schematic structural view of the stator provided by the present utility model.

[0036] In the figure:

[0037] 10. Soft magnetic core; 101. Non-magnetic metal part; 102. Main body; 103. Connecting part; 104. Partition; 1. Rotor; 11. Rotor disk; 2. Stator; 21. Stator disk; 22. Magnetic reinforcement member; 23. Conductor; 3. Rotating shaft. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] Embodiment 1

[0043] The present embodiment provides a soft magnetic core 10, which is formed by extruding soft magnetic material powder in a shaped mold and then annealing and heat treating, wherein a non-magnetic metal part 101 is included inside the soft magnetic core 10. The non-magnetic metal part 101 can act as a reinforcing part inside the soft magnetic core 10, thereby improving the strength of the entire soft magnetic core 10, making it relatively less prone to breakage, and extending the service life of the soft magnetic core 10. In addition, the non-magnetic metal part 101 will not shield the magnetism of the soft magnetic core 10, so the addition of the non-magnetic metal part 101 will not affect the overall magnetism of the soft magnetic core 10, thereby improving the strength of the soft magnetic core 10 while ensuring that the function of the soft magnetic core 10 is not affected.

[0044] In this embodiment, the non-magnetic metal piece 101 can be in a mesh or strip shape, wherein the non-magnetic metal piece 101 is laid in the soft magnetic powder. When the non-magnetic metal piece 101 is in a mesh shape, the staff puts part of the soft magnetic material powder into the mold, lays the non-magnetic metal piece 101, and then puts the soft magnetic material powder. In addition, multiple non-magnetic metal pieces 101 can be provided to further improve the stability inside the soft magnetic core 10. The mesh non-magnetic metal piece 101 can be a whole piece of overall design or a fragmented split design, and there is no specific restriction on the form of the non-magnetic metal piece 101.

[0045] When making the soft magnetic core 10, the soft magnetic material powder and the non-magnetic metal piece 101 are placed in sequence, and the non-magnetic metal piece 101 is mixed into the soft magnetic material powder in this way. The non-magnetic metal piece 101 is designed to be mesh-shaped, which can ensure that the force is balanced everywhere inside the soft magnetic core 10 after molding, and further improve the strength of the soft magnetic core 10. Of course, the non-magnetic metal piece 101 can also be designed to be strip-shaped. When making the soft magnetic core 10, the non-magnetic metal piece 101 is directly mixed into the soft magnetic material powder, and then the two are placed together in a shaping mold to form the final soft magnetic core 10. The magnetic metal piece is designed to be strip-shaped, which can meet the addition of the non-magnetic metal piece 101 while not affecting the production process of the soft magnetic core 10, thereby ensuring that the processing time of the soft magnetic core 10 is not affected. It is understandable that, since the non-magnetic metal part 101 is in the shape of a mesh or a strip, when the non-magnetic metal part 101 is disposed in the soft magnetic core 10, the soft magnetic material powder of the soft magnetic core 10 can be accommodated in the holes of the mesh body and connected with the soft magnetic material powder located on both sides of the mesh body; or the soft magnetic material powder can be connected around the strip body. That is, the soft magnetic core 10 is a whole and is not separated by the non-magnetic metal part 101, which can effectively avoid the problem of weak connection between the soft magnetic material powder and the non-magnetic metal part 101.

[0046] In this embodiment, when the non-magnetic metal piece 101 is in a mesh shape, it can be placed flat inside the soft magnetic core 10. Specifically, a portion of soft magnetic material powder can be filled into the mold cavity and the non-magnetic metal piece 101 can be placed therein. After the two are placed into the mold cavity in turn and then filled with soft magnetic material powder, the non-magnetic metal piece 101 can be placed flat inside the soft magnetic core 10 (see Figure 1 and Figure 2 ). In another embodiment, when the non-magnetic metal part 101 is in a mesh shape, it can also be placed vertically in the soft magnetic core 10; the vertical placement means that the extension direction of the non-magnetic metal part 101 is toward the thickness direction of the soft magnetic core 10. Specifically, the staff can put the soft magnetic material powder into the mold, and then insert the non-magnetic metal part 101 into the soft magnetic material powder at intervals, and then perform subsequent processing steps on the two to finally form the soft magnetic core 10; of course, the non-magnetic metal part 101 can also be placed vertically in the mold cavity and then filled with powder for pressing.

[0047] Exemplarily, the soft magnetic material powder can be formed by pure iron powder and Fe-based soft magnetic materials such as iron silicon, iron silicon chromium, iron silicon aluminum, iron nickel, and iron cobalt. The specific needs are determined by actual requirements and are not specifically limited here.

[0048] Exemplarily, the material of the non-magnetic metal part 101 can be selected from high-nickel steel, high-manganese steel, high-chromium-nickel steel, high-chromium-manganese-nitrogen steel and other steels, and one of iron-manganese, iron-manganese-chromium and iron-manganese-aluminum. The selection of the non-magnetic metal part 101 can be determined according to actual conditions and is not specifically limited.

[0049] Preferably, the non-magnetic metal part 101 can be set as a flexible part, so that the impact resistance of the soft magnetic core 10 can be further enhanced, the internal connectivity of the soft magnetic core 10 can be improved, and the service life of the soft magnetic core 10 can be extended. At the same time, by setting the non-magnetic metal part 101 as a flexible part, the soft magnetic core 10 can be designed as a sphere or a cylinder with a curved surface, so that the use scenarios of the soft magnetic core 10 can be expanded and the versatility of the soft magnetic core 10 can be improved.

[0050] Preferably, in order to ensure the appearance of the soft magnetic core 10 after molding, the laying shape of the non-magnetic metal part 101 in this embodiment is consistent with the cross-sectional shape of the soft magnetic core 10, that is, the non-magnetic metal part 101 can be completely accommodated in the forming mold, thereby avoiding the non-magnetic metal part 101 from being exposed after the soft magnetic core 10 is processed and molded.

[0051] Preferably, a plurality of grooves are provided on the outer surface of the non-magnetic metal part 101, so that the outer surface of the non-magnetic metal part 101 can be made rough. After the soft magnetic material powder is mixed with the non-magnetic metal part 101, the soft magnetic material powder can be attached to the non-magnetic metal part 101 to a greater extent, so that the internal structure of the formed soft magnetic core 10 is more stable. It can be understood that the grooves can be small grooves formed on the outer surface of the non-magnetic metal part 101 due to the large roughness of the outer surface of the non-magnetic metal part 101, so that at least one soft magnetic material powder can be partially or completely accommodated; or the grooves can also be concave cavities formed on the surfaces of both sides of the non-magnetic metal part 101 to form an uneven surface, which can not only increase the connection strength, but also reduce the influence of the non-magnetic metal part 101 on the magnetic field.

[0052] Embodiment 2

[0053] This embodiment provides a flux motor, such as Figure 3 As shown in the figure, it includes a rotor 1 and a stator 2, wherein the stator 2 and the rotor 1 include the soft magnetic core 10 in the first embodiment, and the flux motor also includes a shaft 3, the shaft 3 is connected to the rotor 1 and can rotate with the rotor 1, and the stator 2 is sleeved on the shaft 3. The soft magnetic core 10 is set in the stator 2 and the rotor 1. Since the internal arrangement of the soft magnetic core 10 is composed of a non-magnetic metal part 101, the strength of the soft magnetic core 10 is improved, and it can withstand a larger load, so that it can be applied to a wider range of scenarios.

[0054] Further, the rotor 1 includes a rotor disk 11, and the rotor 1 includes a plurality of soft magnetic cores 10, and the plurality of soft magnetic cores 10 are radially spaced and distributed on the rotor disk 11 along the circumferential direction to form the rotor 1. The stator 2 includes a stator disk 21, and the stator 2 also has a plurality of soft magnetic cores 10, and the plurality of soft magnetic cores 10 are radially spaced and distributed on the stator disk 21 along the circumferential direction to form the stator 2. The soft magnetic cores 10 are spaced and distributed on the stator disk 21 and the rotor disk 11, so that the magnetic balance of the stator 2 and the rotor 1 can be ensured, so as to ensure the magnetic stability of the flux motor, and further improve the load capacity of the flux motor. Preferably, the cross-sectional shape of the soft magnetic core 10 can be designed to be fan-shaped or triangular, so that the soft magnetic core 10 can be arranged more compactly on the stator 2 and the rotor 1, and the layout of the soft magnetic core 10 on the stator 2 and the rotor 1 can also be more reasonably arranged.

[0055] On the other hand, Fig.10As shown, the stator 2 can also be composed of a soft magnetic core 10, a magnetic reinforcement 22, and a conductor 23. The magnetic reinforcement 22 is disposed between the soft magnetic cores 10 and connected to the soft magnetic cores 10 to form an annular body, thus forming the core of the stator 2. When the conductor 23 is disposed on the soft magnetic core 10, the stator 2 is formed. Among them, the magnetic reinforcement 22 can be a permanent magnet.

[0056] To facilitate the assembly of the conductor 23, as Figures 4 to 8 shown, the soft magnetic core 10 includes a main body portion 102 and a connecting portion 103 disposed on the main body portion 102. The main body portion 102 is used to connect with the conductor 23. The conductor 23 can be a plate or wire capable of conducting electricity, such as a copper plate, an aluminum plate, or a copper wire or an aluminum wire. The positional relationship between the main body portion 102 and the connecting portion 103 can be selected according to the performance requirements of the stator 2 in the flux motor, and no specific limitation is made.

[0057] Exemplarily, as shown in FIGS. 4 and Figure 5 shown, the main body portion 102 can be perpendicular to the connecting portion 103 and respectively protrude from opposite sides of the connecting portion 103. The non-magnetic metal member 101 is vertically placed in the main body portion 102. That is to say, when the non-magnetic metal member 101 is only disposed in the main body portion 102 and vertically placed, the core of the stator 2 formed by the soft magnetic core 10 can be applied to the motor structure of a single stator and double rotors. The soft magnetic core 10 can generally be in the shape of an H or a cross.

[0058] Please refer to Figures 6 to 8 , the main body portion 102 can be vertically connected to the connecting portion 103 and protrude from one side of the connecting portion 103. The non-magnetic metal member 101 is disposed in the main body portion 102 and the connecting portion 103. That is to say, the non-magnetic metal member 101 is not only disposed in the main body portion 102 but also can be disposed in the connecting portion 103. At this time, the core of the stator 2 formed by the soft magnetic core 10 can be applied to the motor structure of a double stator and single rotor or the structure of a single stator and single rotor. The soft magnetic core 10 generally presents in the shape of a C, a T, or a sector body with continuous grooves.

[0059] More specifically, please refer to Figures 8 to 10 , when the soft magnetic core 10 presents as a sector body with continuous grooves, the soft magnetic core 10 includes two main body portions 102. The two main body portions 102 are respectively connected to both ends of the connecting portion 103 and protrude from the surface of the connecting portion 103. A partition portion 104 protrudes from the middle of the connecting portion 103. The magnetic reinforcement 22 is disposed between adjacent soft magnetic cores 10, and the conductor 23 is disposed outside the magnetic reinforcement 22 and the main body portion 102 of the adjacent soft magnetic core 10.

[0060] Among them, the non-magnetic metal part 101 includes a connecting section and main body sections arranged on both sides of the connecting section. At this time, the connecting section is a fan-shaped surface, and the main body sections are connected to the connecting section at an angle. Preferably, the main body sections are perpendicular to the connecting section. In actual processing, the connecting section is arranged inside the connecting part 103, and the main body sections are arranged inside the main body part 102. At this time, the non-magnetic metal part 101 inside the soft magnetic core 10 generally presents a "U" shape. The cross-section of the non-magnetic metal part 101 can be designed as a "U" shape to better fit the shape of the soft magnetic core 10 and further improve the strength of the soft magnetic core 10. The non-magnetic metal part 101 can be formed by bending both ends of a sheet-like material, or formed by welding the main body sections and the connecting section. The specific processing method is not limited.

[0061] Preferably, to improve the versatility of the stator 2 in the flux motor, the soft magnetic core and the rotor 1 are separately arranged. Specifically, a plurality of clamping grooves can be arranged at intervals on the rotor 1, and the soft magnetic core body 10 is clamped in the clamping grooves. For the stator 2 of the same size specification, the magnetism of the rotor 1 can be adjusted according to the number of soft magnetic core bodies 10 placed, so as to adjust the flux performance of the flux motor according to actual production needs. At the same time, the soft magnetic core body 10 and the rotor 1 are designed as a separate structure. If a certain soft magnetic core body 10 on the rotor 1 is damaged, it is also convenient for the staff to replace the soft magnetic core body 10, reducing the maintenance difficulty and cost of the flux motor.

[0062] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A soft magnetic core, characterized in that: The soft magnetic core (10) has a non-magnetic metal part (101) inside, and the non-magnetic metal part (101) is extruded together with soft magnetic material powder; The non-magnetic metal piece (101) is in a mesh or strip shape, and the non-magnetic metal piece (101) is laid in the soft magnetic material powder.

2. The soft magnetic core according to claim 1, characterized in that: When the non-magnetic metal piece (101) is in a mesh shape, the non-magnetic metal piece (101) is placed horizontally or vertically inside the soft magnetic core (10).

3. The soft magnetic core according to claim 1, characterized in that: The non-magnetic metal part (101) is a flexible part.

4. The soft magnetic core according to claim 1, characterized in that: The laying shape of the non-magnetic metal piece (101) is consistent with the cross-sectional shape of the soft magnetic core (10).

5. The soft magnetic core according to claim 1, characterized in that: A plurality of grooves are provided on the surface of the non-magnetic metal part (101).

6. A flux motor, comprising a rotating shaft (3), a rotor (1) sleeved on the rotating shaft (3), and a stator (2), wherein the rotating shaft (3) is connected to the rotor (1) and can rotate together with the rotor (1), characterized in that: The stator (2) and / or the rotor (1) comprises the soft magnetic core (10) according to any one of claims 1 to 5.

7. The flux motor according to claim 6, characterized in that: The rotor (1) comprises a rotor disk (11) and a plurality of soft magnetic cores (10), wherein the plurality of soft magnetic cores (10) are radially spaced and distributed on the rotor disk (11) along a circumferential direction; The stator (2) comprises a stator disk (21) and a plurality of soft magnetic cores (10), wherein the plurality of soft magnetic cores (10) are radially spaced and distributed on the stator disk (21) along a circumferential direction; The cross-sectional shape of the soft magnetic core (10) is fan-shaped or triangular.

8. The flux motor according to claim 6, characterized in that: The stator (2) comprises a magnetic reinforcement member (22) and an electrical conductor (23); the magnetic reinforcement member (22) is arranged between the soft magnetic cores (10) and connected to the soft magnetic cores (10) to form an annular body; and the electrical conductor (23) is arranged on the soft magnetic cores (10).

9. The flux motor according to claim 8, characterized in that: The soft magnetic core (10) comprises a main body (102) and a connecting portion (103) arranged on the main body (102), and the conductor (23) is connected to the main body (102); When the main body (102) is protrudingly disposed on both sides of the connecting portion (103), the non-magnetic metal part (101) is disposed inside the main body (102); When the main body (102) is protruding from one side of the connecting portion (103), the non-magnetic metal part (101) is arranged inside the main body (102) and the connecting portion (103).

10. The flux motor according to claim 9, characterized in that: The soft magnetic core (10) is a sector-shaped body with continuous grooves, the soft magnetic core (10) has two main body parts (102), the connecting part (103) connects the two main body parts (102), a partition part (104) is provided on the connecting part (103), and the partition part (104) is located between the two main body parts (102); The non-magnetic metal part (101) inside the soft magnetic core (10) is divided into a connecting section and two main sections, the two main sections are located on both sides of the connecting section, and the main section is connected to the connecting section at an angle.

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